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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012a3183524b15e12a22cd656b0870ccbb714fbe2893abfe475618751eeaaeb3' 
  AND token = '2p7S0xOmx4YBKPOMIkWIuYMqLhWAhdxnJWRy3iy3IJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}